A complete guide to Cambridge IGCSE Biology

Cambridge IGCSE Biology (specification 0610) is the international equivalent of GCSE Biology, run by Cambridge Assessment International Education (CAIE). It is sat by students at international schools worldwide and by some UK independent schools. The qualification is structured around 21 topics and assessed across three or four papers depending on the route you take.

This guide covers everything you need to know to walk into the exam confident: How the papers are structured, which topics are tested, the practical assessment options, and the revision techniques that work best for IGCSE biology.

Cambridge IGCSE Biology is a linear qualification, which means everything you have learned is assessed at the end of the course in one exam series. Most candidates sit the exams in May/June or October/November. There is no coursework.

The qualification is tiered into two routes: Core and Extended. The Core route covers grades C to G and uses easier papers. The Extended route covers grades A* to E and uses harder papers with additional Extended-only content. Your school chooses which route to enter you for, based on your performance during the course.

Core candidates sit Papers 1, 3, and either 5 or 6. Extended candidates sit Papers 2, 4, and either 5 or 6. The practical component is worth 20% of the total grade in both routes. Schools can choose between the Paper 5 practical test or the Paper 6 alternative to practical, which is a written paper on practical skills with no actual lab work.

Cambridge IGCSE Biology is organised into 21 topics that cover the breadth of school-level biology. The Extended spec includes everything in Core plus additional depth on specific topics.

1. Characteristics and classification of living organisms
2. Organisation of the organism (cells, tissues, organs, systems)
3. Movement into and out of cells (diffusion, osmosis, active transport)
4. Biological molecules (carbohydrates, lipids, proteins, water)
5. Enzymes
6. Plant nutrition (photosynthesis and leaf structure)

1. Human nutrition (the digestive system)
2. Transport in plants (xylem, phloem, transpiration)
3. Transport in animals (heart, blood, blood vessels)
4. Diseases and immunity
5. Gas exchange in humans
6. Respiration (aerobic and anaerobic)

1. Excretion in humans
2. Coordination and response (nervous system, hormones, homeostasis)
3. Drugs (medicinal and recreational)
4. Reproduction (plants and humans)
5. Inheritance (genetics, DNA, Punnett squares)

1. Variation and selection (natural and artificial)
2. Organisms and their environment (food chains, energy, nutrient cycles)
3. Human influences on ecosystems (pollution, conservation)
4. Biotechnology and genetic engineering (PCR, GMO crops, antibiotic production)

Cambridge IGCSE Biology has a 20% practical component. Schools can choose between two options for assessing this: Paper 5 (a physical practical test) or Paper 6 (a written alternative to practical paper).

A 1 hour 15 minute practical exam in a lab. You will be given a set of materials and asked to carry out an investigation, record observations, draw graphs, and answer questions on the method. It is marked out of 40.

A 1 hour written paper that tests the same practical skills as Paper 5, but without any physical lab work. You answer questions on methods, variables, observations, and graph drawing using data provided in the paper. It is marked out of 40.

Most international schools choose Paper 6 because it removes the logistical complexity of running a lab exam. Both routes assess the same skills and are worth the same percentage of the final grade.

Cambridge IGCSE Biology is graded A* to G (with U for ungraded). The Core route gives access to grades C to G. The Extended route gives access to grades A* to E. There is overlap in the middle – a strong Core candidate can get a C, and a weaker Extended candidate can also get an E.

Your school chooses the route, usually based on mock results and class performance. Most academically strong students take Extended because it unlocks the higher grades. If you are aiming for university, especially in the UK or US, you will normally be entered for Extended.

Grade boundaries change every year and are set separately for the May/June and October/November exam series. Cambridge publishes the boundaries on results day each August (for May/June) and January (for October/November).

IGCSE Biology covers a wide breadth of topics in less depth than UK GCSE, but the questions can be detailed and unpredictable. The students who get A* train themselves to be precise with biological language and to spot the cue words that examiners reward.

Reading your notes feels productive but barely sticks. Active recall – closing the book and writing what you remember – forces your brain to retrieve information, which is what builds long-term memory. Flashcards work especially well for IGCSE biology because the breadth of content is high.

Cambridge mark schemes are strict about biological definitions. "Diffusion is the net movement of particles from a region of high concentration to a region of low concentration, down a concentration gradient" – memorise this word for word, and do the same for osmosis, active transport, transpiration, photosynthesis, and respiration. These definitions appear in nearly every paper.

Paper 6 questions are excellent revision because they test the same skills as Paper 5 in a written format. Practising them helps you internalise method writing, graph drawing, and error evaluation – all of which are tested on Paper 5 too.

Genetics questions are nearly free marks if your notation is tidy. Draw a clear Punnett square, label the alleles, and write the genotypes and phenotypes of offspring. Examiners reward correct working even when the final answer is wrong, so always show your reasoning.

Doing a past paper and putting it back on the shelf is wasted work. Mark it honestly, write down every topic you got wrong, and revise that specific content before doing another paper. The biggest jumps in IGCSE scores come from fixing recurring weaknesses, not from doing more papers.